BU4809G-TR

Supervisors Overview

The BU4809G-TR is a standard CMOS voltage detector IC manufactured by ROHM Semiconductor, designed for monitoring single-input power supply lines. It features an open-drain output type and operates within a supply voltage range of 0.7 V to 7 V. The typical under-voltage detection threshold is set at 0.9 V with a precision of ±1%. The device includes a hysteresis voltage defined as VDET multiplied by 0.05. It supports a reset active state of low without manual reset or watchdog timer functions. Operating temperatures range from -40°C to +125°C, with circuit currents of 0.40 μA (ON) and 0.55 μA (OFF) at VDET=4.8V.

Supervisors Feature Summary

• CMOS voltage detection with open-drain output for flexible logic interfacing
• High accuracy threshold detection with specified hysteresis to prevent noise-induced false triggering
• Wide operating temperature range suitable for industrial and automotive environments

Supervisors Applications

• Microprocessor system reset circuits
• Battery voltage monitoring in portable devices
• Power supply supervision in embedded systems

Supervisors Procurement Notes

Verify the specific ordering suffix and package variant when sourcing, as availability may vary by region. Confirm RoHS compliance status through official documentation prior to integration. Check current lifecycle status, as this component may be designated as not recommended for new designs. Ensure that the open-drain output configuration matches the target system's input requirements for proper logic level translation.

Supervisors Selection Notes

Select this component when a fixed 0.9 V detection threshold is required for single-channel voltage monitoring. Consider the open-drain output capability if wired-OR configurations are needed. Evaluate the ±1% precision against system tolerance requirements. Compare static current consumption against battery life expectations for low-power applications.

Supervisors Part Context

The BU4809G-TR belongs to the BU48xx series of standard voltage detectors from ROHM Semiconductor. This series provides reliable supervision for various digital and analog circuits. The part is packaged in SSOP-5, offering a compact footprint for space-constrained designs. It serves as a fundamental building block for power management integrity in consumer and industrial electronics.

Supervisors Replacement Considerations

The BD5209G-1 is listed as a similar level replacement with the same package type. Verify electrical parameter compatibility, particularly the detection voltage and output characteristics, before substitution.